Richard Bishop rbishop

A Capistrano Rails Guide

by Jonathan Rochkind, http://bibwild.wordpress.com

why cap?

Capistrano automates pushing out a new version of your application to a deployment location.

I've been writing and deploying Rails apps for a while, but I avoided using Capistrano until recently. I've got a pretty simple one-host deployment, and even though everyone said Capistrano was great, every time I tried to get started I just got snowed under not being able to figure out exactly what I wanted to do, and figured I wasn't having that much trouble doing it "manually".

Step 1: Clone the bundles into your Sublime Text packages directory

cd ~/Library/Application\ Support/Sublime\ Text\ 2/Packages
git clone git://github.com/jashkenas/coffee-script-tmbundle CoffeeScript
git clone https://github.com/miksago/jade-tmbundle.git Jade
git clone https://github.com/LearnBoost/stylus.git Stylus

Step 2: Restart Sublime Text 2

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Business Models

Advertising

Models	Examples
Display ads	Yahoo!
Search ads	Google

Your class can be no longer than 100 lines of code.
Your methods can be no longer than five lines of code.
You can pass no more than four parameters and you can’t just make it one big hash.
When a call comes into your Rails controller, you can only instantiate one object to do whatever it is that needs to be done. And your view can only know about one instance variable.

You can break these rules if you can talk your pair into agreeing with you.

	gem 'mongo'
	gem 'em-mongo'
	gem 'bson_ext'
	gem 'goliath'
	gem 'grape'

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	# Usage: redis-cli publish message hello

	require 'sinatra'
	require 'redis'

	conns = []

	get '/' do
	erb :index
	end

	/*
	* This is just an experiment. Don't read too much into the fact that these are global variables.
	* The basic idea is to combine the two steps of defining a constructor and modifying a prototype
	* into just one function call that looks more like traditional classes and other OO languages.
	*/

	// Utility function
	function mixin(receiver, supplier) {

	if (Object.getOwnPropertyDescriptor) {

	--colour
	-I app